AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B00403HC01
    *A Main Body ECU (Multiplex Network Body ECU) with 2 Connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 2 Connectors - -
    A0028JSC01
    *A Main Body ECU (Multiplex Network Body ECU) with 3 Connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 3 Connectors - -

    1. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F19-1 (DIM) - Body ground BE - Body ground High beam headlight drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V
      F18-23 (AHBI) - Body ground LG - Body ground Auto high beam switch signal input Auto high beam switch on Below 1 V
      Auto high beam switch off 11 to 14 V or Pulse generation
      F19-24 (HU) - Body ground Y - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation
      F19-19 (CLTB) - F19-21 (CLTE) L - G Automatic light control sensor power supply output Ignition switch off, dimmer switch off, 2 minutes after all doors closed Below 1 V
      Ignition switch ON 11 to 14 V
      F19-20 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Ignition switch off, dimmer switch off, 2 minutes after all doors closed Below 1 V
      Ignition switch ON

      Communication waveform generation

      (See waveform 1)
      F19-8 (A) - Body ground B - Body ground Light control switch AUTO position signal input Light control switch in AUTO position Below 1 V
      Light control switch not in AUTO position 11 to 14 V or Pulse generation

      If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.


      1. A002AXON01

        Waveform 1

        Item Content
        Tool setting 2 V/DIV., 10 ms./DIV.
        Vehicle condition Ignition switch ON

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK LANE DEPARTURE WARNING CAMERA

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